Abstract
Several authors over the last 30 years have suggested an association between eye color and susceptibility to both temporary threshold shift (TTS) from noise and noise-induced permanent threshold shift (NIPTS). Pigmentation in the iris is related to the concentration of melanin in the stria vascularis of the cochlea. In earlier research the potential link between susceptibility and pigmentation was not firmly established or explained. More recently, investigators M.-L. Barrenas and P.-A. Hellstrom [Ear Hearing 17, 63–68 (1996)] have suggested possible physiological mechanisms for the effect. This paper summarizes the available literature and provides new data from hearing conservation program audiograms of employees in a large industrial site, compared for groups divided by gender, race, and eye color.
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